docs: def get_pos_hint_x(poshints, sizehintx):
      """Return ``poshints['x']`` if available, or its computed equivalent
      otherwise.
  
      """
      if 'x' in poshints:
          return poshints['x']
      elif sizehintx is not None:
          if 'center_x' in poshints:
              return (
                  poshints['center_x'] -
                  sizehintx / 2
              )
          elif 'right' in poshints:
              return (
                  poshints['right'] -
                  sizehintx
              )